Links relative to the server root are also relative.

[JorgenEvens]

When configuring links that are relative to the root of the webserver in combination with the absolute=true plugin option causes non-absolute links to be generated.

I think the problem lies in the isRelativePath check, which should also consider paths relative to the server root as relative.

Example:

server.register({
    register: require('halacious'),
    options: { absolute: true }
})
.then(() => {
    server.route({
        method: 'GET',
        path: '/items',
        handler: function(req, reply) { reply({}); },
        config: {
            plugins: {
                hal: {
                    links: {
                        keys: '/keys',
                        values: '/values'
                    }
                }
            }
        }
    });
})
.then(() => {
    server.start();
})

Will currently return the following, note that the href for keys and values are not absolute.

{
  "_links": {
    "self": {
      "href": "http://localhost:5000/items"
    },
    "keys": {
      "href": "/keys"
    },
    "values": {
      "href": "/values"
    }
  }
}

[JorgenEvens]

Maybe this needs a different fix, as I just discovered that links which do not have a leading / also suffer from this problem.

hal: {
    links: {
        keys: 'keys',
        values: 'values'
    }
}

Results in

{
  "_links": {
    "self": {
      "href": "http://localhost:5000/items"
    },
    "keys": {
      "href": "keys"
    },
    "values": {
      "href": "values"
    }
  }
}

Would the inverse of https://github.com/bleupen/halacious/blob/master/lib/plugin.js#L632 do the job?